Carl loper



(No Model.) 0. LOPER'.

EXHAUST MUFFLER.

No. 556,427. Patented Mar. 17, 1896.

Wil eases: Jn Veil/0P;

UNITED STATES PATENT OFFICE.

CARL Lorna, or monrnnnnne, GERMANY.

EXHAUST-M UFFLER.

SPECIFICATION forming part of Letters Patent No. 556,427, dated March1'7, 1896.

Application filed December 23, 1895. $eria1llo. 573,073. (No model.)

To all whom it may concern-.-

Be it known that I, CARL LoPER, a subject of the German Emperor,residing at Lichtenberg, near Berlin, in the German Empire, haveinvented certain new and useful Improvements in ExhaustdVIufflers; and Ido hereby declare the following to be afull, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

This invention relates to an improvement in dampers of sound for steamand gas motors.

The apparatus 'represented in the accompanying drawing is fit forobviating totally or almost totally the noise that is caused by theexhaust-steam in high-pressure engines or by the exhaust-gas in gas andpetroleum motors.

The drawing represents a vertical section through the middle of theapparatus.

1 is the exhaust-pipe which connects the engine with the sound-damper.

2 is the usual pot for damping the sound in which the pipe 1 terminates.

3 is a pipe connection. The end of the pipe 3, between 3 and 4 situatedin the pipe 4, is closed. The pipe 3 is provided at its lower side withone or more perforations 11 that form an open connection between thepipes 3 and 4. In the upper end of the pipe 4 and within the latterthere is fixed a cone 5, in the interior of which there is a pipe 6. Theupper end of this pipe is either completely closed, as shown in thedrawing, or is provided with but small openings. The cone 5, the upperend of which may form a cylinder 5, is open at both ends. Between theouter surface of the cylinder 5 and the inner surface of the pipe 4, aswell as between the outer surface of the pipe 6 and the inner under edgeof the cone 5, in each case, an exceedingly small annular slit is leftfree.

At its upper end the pipe 4 is closed hermetically by a cover 9 or anyother suitable arrangement. The piece 9 supports that part of the wholedischarge-pipe that leads directly into. the atmosphere. In the drawingthis exhaust-pipe is signified by 10.

The apparatus acts in the following manner: The gases are pushed throughpipe 1 into the pot 2 and are here submitted to an increase of volume,considerable in comparison with the space occupied in the workingcylinder. Therefore a decrease of tension occurs. The gases pass withthis lessened tension through the pipe 3 and the opening 11 into thepipe 4, and as also this pipe is relatively large compared with the pipe1 receive a further decrease of tension. As the drawing shows, the gasesare at first pushed downward in the pipe 4 and, after having completelychanged the direction of their motion and having at the same time lost apart of their momentum, stream upward to the cone 5. Then the gases arecompelled to pass through the small annular slits 7 and 8 in order topass into the utmost end of the dis charge-pipe or into the atmosphererespectively.

The great friction of the gases in the annular slits 7 and 8 and thefact that the gases are compelled to change the direction of theirmotion twice before they can pass out through the pipe 10 cause aconsiderable decrease of velocity of the gas, so that they stream outinto the atmosphere without any perceptible shock and nearly silently.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat is claimed is- In sound-dampers for the exhaustpipes ofsteam-engines, gas-engines and the like, the combination of a pot 2connected with the said exhaust-pipe 1 and a pipe 4, likewise freelyconnected by a pipe 3 to the said pot with a conic box 5 placed in thepipe 4, said box forming between the outer surface of its upper endshaped by preference cylindrically and the inner surface of the pipe 4 asmall annular slit 7 and forming between its inner under edge and a pipe6 fixed in the said box and not allowing a free passage to theexhaust-gases a second annular slit 8, substantially as and for thepurpose set forth.

I11 testimony whereof I have affixed my signature in presence of twowitnesses,

CARL LOPER. lVitnesses:

JOHN B. JACKSON, MAX WAGNER.

